Hat Hash Hacking at DEFCON

You probably remember that for DEFCON I built a hat that was turned into a game. In addition to scrolling messages on an LED marquee there was a WiFi router hidden inside the hat. Get on the AP, load any webpage, and you would be confronted with a scoreboard, as well as a list of usernames and their accompanying password hashes. Crack a hash and you can put yourself on the scoreboard as well as push custom messages to the hat itself.

Choosing the complexity of these password hashes was quite a challenge. How do you make them hackable without being so simple that they would be immediately cracked? I suppose I did okay with this because one hacker (who prefers not to be named) caught me literally on my way out of the conference for the last time. He had snagged the hashes earlier in the weekend and worked feverishly to crack the code. More details on the process are available after the jump.

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DEFCON 22: The Badge Designers

If you go to DEFCON next year (and you should), prepare for extreme sleep deprivation. If you’re not sleep deprived you’re doing it wrong. This was the state in which we ran into [LosT] and [J0nnyM@c], the brains behind the DEFCON 22 badge and all of the twisted tricks that torture people trying to solve the badge throughout the weekend. They were popular guys but wait around until late into the night and the throngs of hint-seekers subside just a bit.

Plans, within plans, within plans are included in the “crypto” which [LosT] talks about in the interview above. We were wondering how hard it is to produce a badge that is not only electrically perfect, but follows the planned challenge to a ‘T’. This includes things like holding off soldering mask from some pads, and different ones on a different version of the badge. Turns out that you just do as well as you can and then alter the puzzle to match the hardware.

Speaking of hardware. A late snafu in the production threw the two into a frenzy of redesign. Unable to use the planned chip architecture, [J0nnyM@c] stepped up to transition the badges over to Propeller P8X32a chips, leveraging a relationship with Parallax to ensure they hardware could be manufactured in time for the conference.

If you haven’t put it together yet, this is that same chip that Parallax just made Open Source. The announcement was timed to coincide with DEFCON.

DEFCON 22: Hack All the Things

hack-all-the-things-defcon-22

This morning I went to a fantastic talk called Hack All the Things. It was presented by GTVHacker. If you don’t recognize the name, this is the group that hacked the GoogleTV. They haven’t stopped hacking since that success, and this talk is all about 20+ devices that they’ve recently pwned and are making the info public (that link still had oath when I checked but should soon be public).

The attacks they presented come in three flavors: UART, eMMC, and command injection bugs. I’m going to add the break now, but I’ll give a rundown of most of the device exploits they showed off. I found all amusing, and often comical.

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DEFCON 22: Badge Talk

LosT_giving-badge-talk_defcon22

I got a great seat on the main floor for the first big DEFCON 22 talk which is a welcome to the con and discussion of the badge hardware. [LosT], the creator of this year’s badge, started the discussion with a teaser about the badge… there’s a phone number hidden as part of the challenge. [LosT] took a call from someone chasing the puzzles. The guy was in the audience which was pretty fun.

The process of building a puzzle that can be solved at DEFCON is really tough. How do you make it just hard enough that it won’t get pwned right away but easy enough that a large number of attendees will be able to figure it out during the weekend? The answer is to build a secure system and introduce strategic flaws which will be the attack vectors for the attendees solving the badge challenge.

defcon22-badge-cut-traces-to-remove-components

Of course the badge can be used as a development platform. The populated electronics on the board all have these nice little footprints which can be cut to disconnect them from the chip. The breakout headers on either side of the board allow you to connect headers for your own uses. Great idea!

defcon-22_badge-lanyard-glyphs

The back of the lanyards have special characters on them too. This encourages community at the conference. To solve the puzzle you need to find others with different lanyards. Compare the glyphs and crack the code (so far I have no clue!!).

Know what I’m doing wrong? Have suggestions on where to go from here? I’ll be checking the comments!

Hands-On DEFCON 22 Badge

view of front and back

It took a measly 2-hours in line to score myself entry to DEFCON and this nifty badge. I spent the rest of the afternoon running into people, and I took in the RFIDler talk. But now I’m back in my room with a USB cord to see what might be done with this badge.

First the hardware; I need a magnifying glass but I’ll tell you what I can. Tere are huge images available after the break.

  • Parallax P8X32A-Q44
  • Crystal marked A050D4C
  • Looks like an EEPROM to the upper right of the processor? (412W8 K411)
  • Something interesting to the left. It’s a 4-pin package with a shiny black top that has a slightly smaller iridesent square to it. Light sensor?
  • Tiny dfn8 package next to that has numbers (3336 412)
  • Bottom left there is an FTDI chip (can’t read numbers)
  • The DEFCON letters are capacitive touch. They affect the four LEDs above the central letters.

I fired up minicom and played around with the settings. When I hit on 57600 8N1 I get “COME AND PLAY A GAME WITH ME”.

Not sure where I’m going from here. I don’t have a programmer with me so not sure how I can make a firmware dump. If you have suggestions please let me know in the comments!

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Hit the Polls Before Friday

astronot Don’t forget to vote in the newest round of Astronaut or Not. In addition to deciding which projects should be recognized as “Too Cool for Kickstarter”, you will be eligible for the voter lottery.

What is this voter lottery we speak of? On Friday we’ll draw a random number and see if that hacker profile on Hackaday.io has voted at least once in this round, which started on Monday.

If they voted they’ll received a prize package packed with all kinds of prototyping hardware. This cycle offers several breakout boards, a bunch of programmers and debuggers, as well as a digital multimeter and a bench power supply (full list here). For the hackers who haven’t registered a vote? Nothing!

We’ll be drawing the number from a hotel room in Vegas since we’ll be there for DEFCON. If you’re also attending the conference track us down to show off your own hardware or just to grab some stickers.

DEFCON Shenanigans: Hack the Hackaday Hat

We don’t want to call it a challenge because we fear the regulars at DEFCON can turn our piece of hardware into a smoking pile of slag, but we are planning to bring a bit of fun along with us. I’ll be wearing this classy headgear and I invite you to hack your way into the WiFi enabled Hackaday Hat.

I’ll be wearing the hat-of-many-scrolling-colors around all weekend for DEFCON 22, August 7-10th in Las Vegas. You may also find [Brian Benchoff] sporting the accessory at times. Either way, come up and say hello. We want to see any hardware you have to show us, and we’ll shower you with a bit of swag.

Don’t let it end there. Whip out your favorite pen-testing distro and hack into the hat’s access point. From there the router will serve up more information on how to hack into one of the shell accounts. Own an account and you can leave your alias for the scoreboard as well as push your own custom message to the hat’s 32×7 RGB LED marquee.

You can learn a bit more about the hat’s hardware on this project page. But as usual I’ve built this with a tight deadline and am still trying to populate all the details of the project.

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